bug#27810: NS runtime feature detection

["Charles A. Roelli" <charles@aurox.ch>]

I'm not attached to 10.6, but if we can keep supporting it, I'd like to.


And for what it's worth, there are 11 places in nsterm.m with
version-specific code (unless I've missed some):

12 matches for "MAC_OS_X_VERSION_MAX_ALLOWED" in buffer: nsterm.m
     140:#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
     157:#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
    5567:  MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_9
    6329:  MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7
    7036:  MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_9
    7098:  MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_9
    7365:#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
    7516:  MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_9
    7547:  MAC_OS_X_VERSION_MAX_ALLOWED <= MAC_OS_X_VERSION_10_9
    8109:#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_9
    8120:#endif /* MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_9 */
    8327:  MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_7

which seems manageable.  But if and when support for earlier macOSen
causes problems, then I'd have no objections removing support.


On 25/07/2017 19:56, Alan Third wrote:
> On Mon, Jul 24, 2017 at 04:53:02PM -0400, Glenn Morris wrote:
>> FWIW, a comment from someone who is disinterested in OS X:
>>
>> You could probably make your life easier by not supporting more
>> than Apple does. Eg on the net I read:
>>
>>      Apple is only supporting Mac OS X 10.9 – 10.11. Apple stopped
>>      providing security updates for Mac OS 10.8 and earlier versions with
>>      the release of Mac OS X 10.11 (El Capitan) in 2015.
> It would make life a lot easier, we could get rid of almost all
> version dependent code. Just dropping support for 10.6 would remove a
> lot too.
>
> I doubt Charles would like that, though, and he’s the only other
> person regularly working on the NS port.